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Problem with Response.Redirect in ManageUsers.aspx.vb

I'm working on my first ASP.NET application and trying to learn from the portal. My code for adding a user is the same as in the ManagerUsers file. Adding a new user to the database works ok, but then my application crashes on Response.Redirect command in the
PageLoad event with the following error: Invalid file name for monitoring: 'c:\inetpub\wwwroot\ThirdYearProject\~'. File names for monitoring must have absolute paths, and no wildcards. This is the line in my code: Response.Redirect(("~/memberdetails.aspx?memberid="
& uid & "membername=" & username)) I've searched this forum and via Google, but can't find this problem documented anywhere. I can't figure out why that line works in the portal but not for me.